main() {
  //运算符
  //1.算术运算符
  print(1+2);
  print(1-2);
  print(1*2);
  print(1/2);
  print(1~/2);
  print(1%2);
  //2.逻辑运算符
  print(true&&false);
  print(true||false);
  print(!true);
  //3.关系运算符
  print(1==2);
  print(1!=2);
  print(1>2);
  print(1<2);
  print(1>=2);
  print(1<=2);
  //4.赋值运算符
  int a = 10;
  a += 2;
  print(a);
  a -= 2;
  print(a);
  a *= 2;
  print(a);
  a = (a / 2).toInt();
  print(a);
  a ~/= 2;
  print(a);
  a %= 2;
  print(a);
  //5.位运算符
  print(1<<2);
  print(1>>2);
  print(1&2);
  print(1|2);
  print(1^2);
  print(~1);



}